'double slit experiment problem'

[farhanshahid]

Homework Statement

q. when the width of both slits in double slit experiment is increased or decreased what happens to:
1. separation of fringes
2. brightness of light fringes
3. brightness of dark fringes

and why?

Homework Equations

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The Attempt at a Solution

couldnt think of any thing

 

[ideasrule]

Do you know the formula sin(theta)=n*lambda/d? You should be able to answer 2 and 3 just by thinking about what happens if the slit width is made very large.

 

[farhanshahid]

Do you know the formula sin(theta)=n*lambda/d? You should be able to answer 2 and 3 just by thinking about what happens if the slit width is made very large.

i know the equation but it does not deal with the WIDTH of the slits instead it deals with the SLIT separation.